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feat(dashboard): add group usage distribution chart to usage page

Add a doughnut chart showing usage statistics broken down by group on
the admin usage records page. The chart appears alongside the existing
model distribution chart (2-column grid), with the token usage trend
chart moved to a separate full-width row below.

Changes:
- backend/pkg/usagestats: add GroupStat type
- backend/service: add GetGroupStatsWithFilters interface method and implementation
- backend/repository: implement GetGroupStatsWithFilters with LEFT JOIN groups
- backend/handler: add GetGroupStats handler with full filter support
- backend/routes: register GET /admin/dashboard/groups route
- backend/tests: add GetGroupStatsWithFilters stubs to contract/sora tests
- frontend/types: add GroupStat interface
- frontend/api: add getGroupStats API function and types
- frontend/components: add GroupDistributionChart.vue doughnut chart
- frontend/views: update UsageView layout and load group stats in parallel
- frontend/i18n: add groupDistribution, group, noGroup keys (zh + en)

fix(group): clear nullable limit fields on update

Upgrade GitHub Actions to latest versions

feat: add mixed-channel warning for bulk account edit

feat(admin): add create-and-redeem endpoint for payment integrations

Upgrade GitHub Actions for Node 24 compatibility

- Move ADMIN_PAYMENT_INTEGRATION_API.md → docs/ADMIN_PAYMENT_INTEGRATION_API.md
- Update README.md reference path
- Add payment integration doc download link in admin settings UI (Purchase section)
- Add i18n keys: integrationDoc / integrationDocHint (zh + en)

feat(gateway): 添加 Claude Code 客户端最低版本检查功能

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

- 修复 errcheck: singleflight 返回值类型断言添加 ok 检查
- 修复 gofmt: 格式化 setting_service.go 和 claude_code_validator_test.go
- 修复 TestAPIContracts: 在 GET /admin/settings 期望中添加 min_claude_code_version 字段

- 通过 User-Agent 识别 Claude Code 客户端并提取版本号
- 在网关层验证客户端版本是否满足管理员配置的最低要求
- 在管理后台提供版本要求配置选项（英文/中文双语）
- 实现原子缓存 + singleflight 防止并发问题和 thundering herd
- 使用 context.WithoutCancel 隔离 DB 查询，避免客户端断连影响缓存
- 双 TTL 策略：60s 正常、5s 错误恢复，保证性能与可用性
- 仅检查 Claude Code 客户端，其他客户端不受影响
- 添加完整单元测试覆盖版本提取、比对、上下文操作

- BulkUpdate handler: add structured details to 409 response
- BulkUpdateAccounts: simplify to global pre-check before any DB write;
  remove per-account snapshot tracking which is no longer needed
- MixedChannelError.Error(): restore English message for API compatibility
- BulkEditAccountModal: use t() with details for both pre-check and 409
  fallback paths instead of displaying raw backend strings
- Update test to verify pre-check blocks on existing group conflicts

Previously, preCheckMixedChannelRisk() skipped when selectedPlatforms
had more than one entry, and the catch block in submitBulkUpdate had no
409 handling — so multi-platform conflicts just showed a generic error.

- Rename canPreCheck(): only call pre-check API for single-platform
  antigravity/anthropic selections (API requires a single platform param)
- Pass `built` into preCheckMixedChannelRisk() so pendingUpdatesForConfirm
  is set before returning false
- submitBulkUpdate: add 409 mixed_channel_warning catch as fallback for
  multi-platform case, saving baseUpdates for retry
- Remove needsMixedChannelCheck() gate on confirm_mixed_channel_risk flag;
  use mixedChannelConfirmed alone so multi-platform retry also works

The response interceptor in client.ts transforms errors into plain
objects {status, code, message}, but catch blocks were checking
error.response?.status (AxiosError format) which never matched.

- Add error field passthrough in client.ts interceptor
- Refactor BulkEditAccountModal to use pre-check API (checkMixedChannelRisk)
  before submit, matching the single edit flow
- Fix EditAccountModal catch blocks to use interceptor error format
- Add bulk-update mixed channel unit tests

- Move mixed channel check before any DB writes in BulkUpdateAccounts
- Return 409 from BulkUpdate handler for MixedChannelError
- Add ConfirmDialog to BulkEditAccountModal for mixed channel warning
- Update mixed channel warning message to Chinese

- 移除 README.md / README_CN.md 中的 Codex CLI WebSocket v2 配置示例
- UseKeyModal OpenAI 分组新增 "Codex CLI (WebSocket)" tab，区分普通模式与 WS 模式
- 普通模式 config.toml 不含 WebSocket 字段，WS 模式包含 supports_websockets 和 features 配置
- 所有配置统一使用 sub2api 作为 model_provider 名称

standalone gosec 扫描 24 万行 Go 代码在 CI 中持续超时，
将其作为 golangci-lint 的内置 linter 运行，复用 AST 解析和缓存大幅提速。

- 在 .golangci.yml 中启用 gosec 并迁移原有排除规则
- golangci-lint timeout 从 5m 提升到 30m
- 从 security-scan.yml 移除 standalone gosec 步骤
- 删除不再需要的 .gosec.json 配置文件

fix(ops): validate error_type against known whitelist before classification

feat: 添加账号级别 RPM（每分钟请求数）限流功能

为 gosec 添加 -exclude-generated 标志，跳过带有
"// Code generated" 注释的文件（如 wire_gen.go），
防止安全扫描因分析自动生成代码而超时。

feat(admin): 添加管理员直接修改用户 API Key 分组的功能 

feat/admin-apikey-group-update 分支给 UserRepository 接口新增了
AddGroupToAllowedGroups 方法，需要在测试 stub 中补充实现以通过编译。
- sora_client_handler_test.go: stubUserRepoForHandler
- sora_generation_service_test.go: stubUserRepoForQuota

Add missing nil argument for rpmCache to NewAccountHandler (5 sites)
and NewGatewayService (2 sites) after RPM feature expanded their
signatures.

Ensures base_rpm validation (clamp 0-10000) is consistent across
all four account mutation paths: Create, Update, BulkUpdate, BatchCreate.

- Add sanitizeExtraBaseRPM to BulkUpdate handler (was missing)
- Add WindowCost scheduling checks to legacy non-sticky selection
  paths (4 sites), matching existing sticky + load-aware coverage
- Export ParseExtraInt from service package, remove duplicate
  parseExtraIntForValidation from admin handler